Improvement in hot-blast-oven pipes



J; MCLANAHAN.

improvementin Hot-Blast Oven-Pipes.

'Patented July 23,1872.A

J. KING MCLANAHAN, @F HOLLIDAYSBURG, PENNSYLVANIA.

IMPROVEMENT IN HO'f-BLAST-OVEN PIPES.

` specification forming part f Letters Patent No. 129,744, dated July 23, 1972.

Specification describing a new and useful Improvement in Diaphragm-,Pipes for Heaters, invented byJ. KING MCLANAHAN, of Hollidaysburg, in the county of Blair and State of Pennsylvania.

My invention consists in casting the upper ends of the diaphrag`m-pipes used in hot-air ovens for blast-furnaces together with the other i part of said pipes to form a solid and permanent top, and dispense with the plugs cemented in the open ends ofthe pipes, as heretofore made, which often burn out and fail, so that it becomes necessary to cool down the blast-furnace,

which is very expensive and often injurious to the hearth and bosh. The said pipes have heretofore been cast with open ends at the top for the escape of the gases through the core, and because the core can be more readily drawn out that way; but I now propose to cast the said pieces bottom end up to afford the same chance for the escape of the gas, and yet cast the ends to be used uppermost solid, for which I have devised a core adapted for casting the pipes in this way and forming the opening in the upper end of the diaphragm, and yet so that, by Adetaching some of tliesand at the lower end, it can be drawn out.

Figure 1 in the drawing is a sectional elevation of one of these diaphragmpipes in the position in which I propose Ato cast it; also a i section of a core that may be used. Fig. 2 is a top View of the pipe as represented in Fig. l.

Similar letters of reference indicate corresponding parts.

A is the said pipe; B, the diaphragm 5 and C, the top, which latter I propose to cast solid with the other part, as clearlyr shown in the drawing, for which I use a bifurcated perforated tube, D, for a core-bar 0n which to pack the sand, as shown, and I make a long slot, E, in the sand ofthe core, as shown, for the mold for the diaphragm B, which said slot will terminate near the lower end, as far therefrom as the required length of the opening above .the top of said diaphragm and the top C ofthe pipe. This part of the core directly below the slot for the diaphragm, being of sand only, will break off readily When 4'the core is to be drawn out but I do not limit myself to the form of the core here shown, nor t0 any particular core, my object being to cast the tops of these diaphragm-pipes on solid in any way.

Having thus described my invention, I claim as new and desire to secureby Letters Patent The diaphragm airheating pipes for air-heatf Witnesses:

W. W. JACKSON, J osIAH A. BORDER.

ATENT FTICE. 

